What is the coal standard for power generation

At present, there are two types of boilers used in thermal power plants: pulverized coal boilers and circulating fluidized bed boilers. Due to the design conditions and characteristics of the equipment, the calorific value of the thermal coal used in the pulverized coal furnace is higher, generally greater than 4000 kcal (to ensure the furnace temperature, so as to avoid fire extinguishing or deflagration accidents), that is to say, the coal used in the combustion of the pulverized coal furnace The ash content is relatively small, generally less than 30%, and the desulfurization equipment of the pulverized coal furnace is expensive, so the sulfur content of the coal burned is required to be as small as possible. The requirements are very low. Generally, coal larger than 2500 kcal can be burned (the lower it is, it is easier to extinguish the fire), and there are cheap desulfurization equipment (limestone is added to the furnace) for the sulfur content of coal. Generally speaking, the circulating flow The coal used in the chemical bed boiler is mixed with two types of coal, one with relatively high calorific value, and the other with inferior coal (this kind of coal is difficult to use in other industries, such as coal gangue), which is beneficial to the long-term stable operation of the equipment. and reduce wear and tear.